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EP 3 931 379 A1

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(43) Date of publication: 05.01.2022 Bulletin 2022/01 (21) Application number: 20710289.8 (22) Date of filing: 26.02.2020

(51) International Patent Classification (IPC):  D01F 8/06(2006.01) D01D 5/42(2006.01) D01F 8/14(2006.01) (52) Cooperative Patent Classification (CPC): D01F 8/14; D01D 5/426; D01D 5/423; D01F 8/06 (86) International application number: PCT/IB2020/051640 (87) International publication number: WO 2020/174419 (03.09.2020 Gazette 2020/36)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 28.02.2019 US 201962812020 P (71) Applicant: 3M Innovative Properties Company Saint Paul, Minnesota 55133-3427 (US)

(72) Inventors: JOST, Kristy A. Saint Paul, Minnesota 55133-3427 (US) REN, Liyun Saint Paul, Minnesota 55133-3427 (US) HUANG, Rongzhi Woodbury, Minnesota 55129 (US) KOPECKY, William J. Saint Paul, Minnesota 55133-3427 (US) JONZA, James M. Saint Paul, Minnesota 55133-3427 (US) OUDERKIRK, Andrew J. Saint Paul, Minnesota 55133-3427 (US) (74) Representative: Vossius & Partner Patentanwälte Rechtsanwälte mbB  Siebertstraße 4 81675 München 81675 München (DE)